Properties of the Number 20738

Twenty Thousand Seven Hundred Thirty-Eight

Basics

Value: 20737 → 20738 → 20739

Parity: even

Prime: No

Previous Prime: 20731

Next Prime: 20743

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 10369

Divisors: 1, 2, 10369, 20738

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000100000010

Octal: 50402

Duodecimal: 10002

Hexadecimal: 5102

Square: 430064644

Square Root: 144.00694427700353

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Coordination sequence for C₃ lattice: a(n) = 16·n² + 2 (n>0), a(0)=1. A10006

Number of ten-prime Carmichael numbers less than 10ⁿ. A299710

Triangle read by rows: number of permutations of [1..n] with k progressions of rise 2, distance 1 and length 3 (n >= 0, k >= 0). A216716

a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 1,1,-2,-1. A111571

Tanimoto triangle read by rows: T(n,k) = number of "parity-alternating permutations" (PAPS) of n symbols with k ascents. A125300

Expansion of ∑_k>0 x^3·k/(1 - k·x^k)³. A363644

a(n) = F(n+3) * F(n+1) + (-1)ⁿ where F(n) = A000045(n) are the Fibonacci numbers. A338225

Appearance radii of visible vectors in the medial axis test mask for the Euclidean distance in Z². A171988

a(n) = F(n+1)², if n>=0 is even (F=A000045) and a(n) = (L(2n+2)+8)/5, if n is odd (L=A000204). A208176

Least number m such that there exist exactly n pairs of numbers (a,b), 0 < a < b < m, such that a+b, a+m, and b+m are all squares. A246766